新型输电线路用碳纤维复合芯蠕变行为预测

CREEP BEHAVIOR PREDICTION FOR COMPOSITE CORE OF NOVEL ELECTRIC CONDUCTOR

碳纤维复合芯导线是电力行业新型架空输电线路关键部件。运行过程中主承力件复合材料芯棒长期受拉力作用会产生蠕变,电网线路设计部门亟待了解复合芯棒的长期变形行为以考核其耐久性。本文利用时-温叠加原理,通过测量高温下复合材料蠕变行为成功预测了工况温度下的材料蠕变。研究利用动态热机械分析仪对完全和未完全固化的复合芯棒进行了加速蠕变测试,通过平移将短期蠕变数据结合生成长期蠕变柔量叠加曲线,预测出复合芯棒在设计寿命期间的蠕变水平。研究结果表明,在120 C下,30年的工作期限中,完全固化混杂复合材料棒材的柔量只有少量提高(约5%),说明其在该温度下的复合芯蠕变量很小,复合芯棒材具有优异的高温抗蠕变性。

Abstract： Hybrid composite rods, comprised of unidirectional reinforcing carbon/glass-fiber and adhesive ep- oxy matrix, are viewed as promising candidates to be used in high-voltage overhead conductors. However, before widespread application, their long-term durability needs to be clarified. In this study, accelerated creep testing for hybrid composite rods, both fully-cured and unfully-cured ones, is presented by taking dynamic mechanical analysis tests at different temperatures. Using the time-temperature superposition principle and thermal activation energy the- ory, the short-term creep data are combined to generate creep long-term compliance master curves. Through the master curve, predictions can be made concerning the creep levels that will occur during the design lifetime of hy- brid composite rods （i. e., 30 years）. It is found that after 30-year service at 120, fully-cured hybrid composite rods only exhibit a slight increase in compliance （ about 5% ）, indicating a satisfactory creep resistance at this tem- perature.